South Corridor LRT Design Report: – SR 99 and I-5 Alignment Scenarios (S 200Th Street to Tacoma Dome Station) – Tacoma Link Extension to West Tacoma
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Sound Transit Phase 2 – South Corridor LRT Design Report: – SR 99 and I-5 Alignment Scenarios (S 200th Street to Tacoma Dome Station) – Tacoma Link Extension to West Tacoma Prepared for: Sound Transit Prepared by: PB In association with: Parametrix, Inc. FINAL October 2007 Updated: December 2008 Note: The October 2007 version of this report has been updated in this December 2008 report to present costs in year 2007 dollars. Table of Contents 1 Foreword ............................................................................................................1 2 Summary ............................................................................................................4 2.1 LRT Extension along SR 99 Corridor.............................................................4 2.2 LRT Extension along I-5 Corridor...................................................................5 2.3 Tacoma Link Extension to Tacoma General Hospital.....................................5 2.4 Estimated Costs for LRT Extensions..............................................................5 3 Prototypical LRT Alignments in the South Corridor .......................................6 3.1 Background for Prototypical LRT Extensions .................................................6 3.1.1 Planning, Engineering, and Environmental Studies .........................6 3.1.2 Project Definitions ...........................................................................7 3.1.3 Design Guidelines ...........................................................................7 3.2 SR 99 LRT Alignment Scenario .....................................................................8 3.2.1 Prototypical Alignment for SR 99 Scenario....................................10 3.2.2 Project Descriptions (Segment and Stations) ................................10 3.3 I-5 LRT Alignment Scenario.........................................................................16 3.3.2 Project Descriptions for the I-5 Scenario (Segment and Stations) .19 3.4 Operations and Maintenance Facility...........................................................25 3.4.1 Lead Tracks to the Operations and Maintenance Base .................26 3.4.2 Base Capacity...............................................................................26 3.4.3 Major Activities for the Operations and Maintenance Facility.........26 3.5 Tacoma Link Extension to Tacoma General Hospital...................................27 3.5.1 Prototypical Alignment for Tacoma Link Extension to Tacoma General Hospital ....................................................................................29 3.5.2 Project Descriptions for Tacoma Link Extension to Tacoma General Hospital (Project S7B) ..............................................................29 3.5.3 Additional Vehicles and Maintenance/Operations Base Needs......30 3.6 Alternative Approaches to LRT Extensions in Pierce County .......................30 4 Basis of Project Definition ..............................................................................31 4.1 Civil Engineering..........................................................................................31 4.1.1 Base Mapping ...............................................................................31 4.1.2 Utilities ..........................................................................................31 4.2 Right of-Way Issues.....................................................................................31 4.2.1 SR 509 Extension..........................................................................32 4.2.2 SR 99 Alignment ...........................................................................32 4.2.3 Maintenance and Operations Base................................................32 4.2.4 Potential New SR 167/I-5 Interchange...........................................32 4.2.5 Construction Staging Areas...........................................................32 4.3 Structural .....................................................................................................33 4.3.1 Aerial Guideway ............................................................................33 4.3.2 Retained Cut/Fill............................................................................33 4.3.3 Semi-Exclusive Surface.................................................................33 4.4 Geotechnical................................................................................................33 5 Environmental Considerations .......................................................................34 6 Third Party Coordination.................................................................................34 6.1 SR 509 Extension ........................................................................................34 ST2 South Corridor Design Report December 2008 i PB 6.2 Triangle Project............................................................................................34 6.3 I-5 HOV Lanes in Tacoma............................................................................35 7 Systems............................................................................................................35 7.1 Communications..........................................................................................35 7.2 Signals.........................................................................................................35 7.3 Electrical Systems .......................................................................................36 7.4 Traction Power.............................................................................................36 APPENDICES Appendix A: List of Supporting Documents Appendix B: South Corridor Alignment Drawings (under separate cover) Appendix C: Third Party Input Appendix D: Alignment Sketches and Photos Appendix E: Puyallup River Crossing Technical Memo Appendix F: At-Grade Scenario, Federal Way to Port of Tacoma Technical Memo Appendix G: LRT Operation and Maintenance Facility Alternatives Technical Memo Appendix H: South Corridor ROW Drawings (under separate cover) Appendix I: Project Descriptions and Cost Estimates ST2 South Corridor Design Report December 2008 ii PB List of Tables Table 1: Alignment Summary SR 99 Scenario..............................................................10 Table 2: Alignment Summary I-5 Scenario ...................................................................18 Table 3: Alignment Summary: Tacoma Link Extension to Tacoma General Hospital....29 List of Figures Figure 1: Possible ST2 South Corridor LRT Extensions .................................................3 Figure 2: Prototypical SR 99 South Corridor Light Rail Alignmen ...................................9 Figure 3: Prototypical I-5 South Corridor Light Rail Alignment ......................................17 Figure 4: Tacoma Link Extension to Tacoma General Hospital ....................................28 ST2 South Corridor Design Report December 2008 iii PB 1 Foreword The purpose of this planning effort is to define a Sound Transit Phase 2 (ST2) light rail transit (LRT) project between S. 200th Street and Tacoma Dome Station via both the I-5 and the SR 99 corridors. Project definitions include a prototypical alignment and representative transit stations. This definition is the primary source of information used to prepare conceptual cost estimates for potential LRT systems serving the South Corridor. The alignments developed for cost estimating do not presume that a preferred alignment has been selected for the corridor. It is anticipated that this initial effort will be supplemented by additional engineering, alternatives analyses and environmental studies as the project advances. This design report provides definition for potential Sound Transit ST2 LRT projects in the South Corridor. Under separate reports, similar project definitions and costs have been prepared for potential LRT projects for the North and East Corridors. Extension of the Link LRT system in the South Corridor fall into two general categories: 1. Extension of Central Link from the planned S. 200th Street Station to Tacoma Dome; 2. Extension of Tacoma Link from its north terminus in downtown Tacoma to Tacoma General Hospital As part of Sound Move, project definition and cost estimates were prepared for a prototypical LRT line between SeaTac Airport and S. 200th Street (see Figure 1 for a map showing the extensions covered in this design report). For the S. 200th Street/Tacoma Dome Station corridor, two prototypical alignments were developed for LRT extensions. One alignment follows the general SR 99 corridor while the second follows the I-5 corridor. Each corridor was considered in two sections, S. 200th Street to Federal Way Transit Center and Federal Way Transit Center to Tacoma Dome Station. A blended approach made up of the I-5 and SR 99 corridors was also considered for the purpose of ST2 financial modeling. Project definitions included in this design report address prototypical alignments and representative LRT stations. These alignments and stations serve as primary sources of information for conceptual cost estimates of LRT development in the South Corridor. For cost estimating purposes, definitions of potential LRT extensions did not presume a preferred alignment along the affected corridor. As LRT extension projects advance in design and other activities, it is anticipated that the work documented in this report will be supplemented by additional engineering, alternatives analyses, and environmental